and installed Kakao from the Google Play Store. Straight up, latest Android ver. 5.5.5. Works great with the current android runtime.

When I said headless, I meant getting notifications w/o having the app opened or ran in the background. Unfortunately, hub isn't smart enough to display the actual message. But it does show who the sender was.

It's not 100% consistent either. On iOS and android, messages get delivered instantaneously. And I thought so too on my Classic, but there was this one time where I wasn't getting any notifications. So maybe 90%?

If my life (or someone else's) depended on Kakao, I would think twice about a Blackberry (unless leaving Kakao opened/ran in background doesn't bother you).